Overall survival from the phase 3 postMONARCH trial of abemaciclib + fulvestrant vs placebo + fulvestrant for HR+, HER2- advanced breast cancer following progression on a prior CDK4/6 inhibitor + endocrine therapy
https://esmocongress.esmo.org
ESMO 2026
2026 年 10 月 23–27 日 · Madrid · 共 3194 条
POSTMONARCH
★★★22 人 · 23 条 · 1 篇摘要
本事件热度走势
当前热度 8·可比范围峰值 12(10月24日 19:00)·近 24 小时可比范围变化 –·当前参与者 15
在HR+/HER2-晚期乳腺癌中,阿贝西利联合氟维司群的循证地位已由两项III期试验奠定:MONARCH 2在CDK4/6i未经治人群、postMONARCH在经治人群中分别证实联合方案优于氟维司群单药[4]。postMONARCH为双盲III期研究,按1:1随机入组368例患者(阿贝西利+氟维司群182例,安慰剂+氟维司群186例),主要终点为研究者评估的PFS[1];其阿贝西利+氟维司群组PFS为6.0个月,且入组患者中仅8%既往使用过阿贝西利[3]。CDK4/6抑制剂进展后继续抑制该通路——同药续用或换用另一种CDK4/6i并更换内分泌搭档——此前被视为有潜力但证据有限的策略,在未经生物标志物选择的人群中获益相当有限[2]。
本次ESMO26上,Kevin Kalinsky等以快速口头报告(10月24日)公布postMONARCH的最终OS分析:368例既往CDK4/6i+内分泌治疗进展的HR+/HER2-晚期乳腺癌患者,随机接受阿贝西利或安慰剂联合氟维司群。中位OS为32.1 vs 24.6个月,HR 0.80(0.60–1.06),p=0.1145,未达统计学显著;更新PFS为HR 0.78(0.62–0.99),nominal p=0.0390;安全性与阿贝西利既有的安全性特征一致,无新信号。
相对以PFS为主要终点的已发表主要分析[1],此次读数把证据链延伸到最终OS层面:中位OS数值上延长7.5个月,虽未跨过显著性阈值,但与PFS信号方向一致。现场的总体结论是,尽管PFS绝对获益不大,整体证据仍支持在既往CDK4/6i+ET进展后考虑以阿贝西利为基础的治疗。多位评论者把关键落在患者选择上——即谁在进展后仍保持CDK通路依赖——这与综述中“未经生物标志物选择人群获益有限、ctDNA指导下继续CDK4/6i有待III期验证”的判断相呼应[2]。另需注意,postMONARCH中仅8%患者既往用过阿贝西利[3],同药再挑战的证据目前主要来自II期again研究(总体中位PFS 4.2个月,换用氟维司群者7.1个月)[3]。
局限方面:OS未达统计学显著(p=0.1145),PFS的p值仅为nominal,不足以单凭该读数确立OS获益;现场帖也未披露生物标志物亚组、后续治疗等信息,哪些患者真正从继续CDK4/6抑制中获益仍待确认——正如评论者所言,这是postMONARCH留下的精准治疗问题。
- 1.Abemaciclib Plus Fulvestrant in Advanced Breast Cancer After Progression on CDK4/6 Inhibition: Results From the Phase III postMONARCH Trial · J Clin Oncol 2025
- 2.Unveiling the Potential of Cyclin-Dependent Kinases 4 and 6 Inhibitors Beyond Progression in Hormone Receptor Positive/Human Epidermal Growth Factor Negative Advanced Breast Cancer - A Clinical Review · Curr Treat Options Oncol 2024
- 3.Abemaciclib rechallenge after progression on abemaciclib plus endocrine therapy in patients with hormone receptor-positive HER2-negative metastatic breast cancer: results from the phase II again study (WJOG14220B) · Breast Cancer Res Treat 2026
- 4.Imlunestrant plus abemaciclib versus fulvestrant plus abemaciclib in ER-positive, HER2-negative advanced breast cancer: an indirect treatment comparison of three phase III trials · ESMO Open 2026
- 5.Models of Early Resistance to CDK4/6 Inhibitors Unveil Potential Therapeutic Treatment Sequencing · Int J Mol Sci 2025
OncoAlert@OncoAlert Yakup Ergün@dr_yakupergun Gil Morgan, MD@weoncologists 引用@OncoAlert 4Sight Abstracts to be Presented at #ESMO26 1RO: Final Overall Survival Analysis of postMONARCH: Abemaciclib Plus Fulvestrant After Progression on Prior CDK4/6 Inhibitor in HR+, HER2– Advanced Breast Cancer @KalinskyKevin @BianchiniGP @ErikaHamilton9 @DrSGraff @drsarahsam @MuozMateu 🔬 Phase 3, double-blind trial (n=368): abemaciclib or placebo plus fulvestrant in HR+, HER2– ABC after progression on prior CDK4/6i + ET. Final OS analysis. ➡️ Median OS 32.1 vs 24.6 mo; HR 0.80 (0.60–1.06); p=0.1145, statistical significance not reached ➡️ Updated PFS HR 0.78 (0.62–0.99); nominal p=0.0390 ➡️ Safety consistent with the established abemaciclib profile; no new signals ✅ Numerically longer median OS, not statistically significant. While absolute PFS benefit was modest, overall evidence supports considering abemaciclib-based treatment after disease progression on prior CDK4/6i + ET. #BreastCancer 🎙️ Kevin Kalinsky 👥 Giampaolo Bianchini · Erika Hamilton · Stephanie Graff · Kyong Hwa Park · Rinath Jeselsohn · Umut Demirci · Miguel Martin · Rachel Layman · Sara Hurvitz · Sarah Sammons · Peter Kaufman · Montserrat Muñoz · Jiun-I Lai · Holly Knoderer · Cynthia Sandoval · Aarti Chawla · Bastien Nguyen · Yanhong Zhou · Elizabeth Ravenberg · Lacey Litchfield · Lillian Smyth · Seth Wander (4Sight Made from Abstracts publicly available at the ESMO website) Pinging OncoAlert Breast Cancer Faculty @matteolambe @aftimosp @E_de_Azambuja @DrSGraff @ErikaHamilton9 @hoperugo @stolaney1 @BianchiniGP @aftimosp @kevinpunie @ElisaAgostinett @to_be_elizabeth @GaiaGriguolo @JankovicK @raalbany @JavierCortesMD @JaniceTNBCmets @Prof_Nadia_H @LoiSher @jamecancerdoc @Lucarecco @Dr_Oncologista
Kristina Jankovic, MD@JankovicK 引用@OncoAlert 4Sight Abstracts to be Presented at #ESMO26 1RO: Final Overall Survival Analysis of postMONARCH: Abemaciclib Plus Fulvestrant After Progression on Prior CDK4/6 Inhibitor in HR+, HER2– Advanced Breast Cancer @KalinskyKevin @BianchiniGP @ErikaHamilton9 @DrSGraff @drsarahsam @MuozMateu 🔬 Phase 3, double-blind trial (n=368): abemaciclib or placebo plus fulvestrant in HR+, HER2– ABC after progression on prior CDK4/6i + ET. Final OS analysis. ➡️ Median OS 32.1 vs 24.6 mo; HR 0.80 (0.60–1.06); p=0.1145, statistical significance not reached ➡️ Updated PFS HR 0.78 (0.62–0.99); nominal p=0.0390 ➡️ Safety consistent with the established abemaciclib profile; no new signals ✅ Numerically longer median OS, not statistically significant. While absolute PFS benefit was modest, overall evidence supports considering abemaciclib-based treatment after disease progression on prior CDK4/6i + ET. #BreastCancer 🎙️ Kevin Kalinsky 👥 Giampaolo Bianchini · Erika Hamilton · Stephanie Graff · Kyong Hwa Park · Rinath Jeselsohn · Umut Demirci · Miguel Martin · Rachel Layman · Sara Hurvitz · Sarah Sammons · Peter Kaufman · Montserrat Muñoz · Jiun-I Lai · Holly Knoderer · Cynthia Sandoval · Aarti Chawla · Bastien Nguyen · Yanhong Zhou · Elizabeth Ravenberg · Lacey Litchfield · Lillian Smyth · Seth Wander (4Sight Made from Abstracts publicly available at the ESMO website) Pinging OncoAlert Breast Cancer Faculty @matteolambe @aftimosp @E_de_Azambuja @DrSGraff @ErikaHamilton9 @hoperugo @stolaney1 @BianchiniGP @aftimosp @kevinpunie @ElisaAgostinett @to_be_elizabeth @GaiaGriguolo @JankovicK @raalbany @JavierCortesMD @JaniceTNBCmets @Prof_Nadia_H @LoiSher @jamecancerdoc @Lucarecco @Dr_Oncologista
Elisa Agostinetto@ElisaAgostinett Sherene Loi, MD@LoiSher Stephanie Graff, MD, FACP, FASCO@DrSGraff Aya Mohamed | MSc, MD 🎗@Dr_Oncologista Elisabetta Bonzano MD, PhD@to_be_elizabeth Oncology Brothers@OncBrothers Dra. María Natalia Gandur Quiroga@nataliagandur 引用@OncoAlert 4Sight Abstracts to be Presented at #ESMO26 1RO: Final Overall Survival Analysis of postMONARCH: Abemaciclib Plus Fulvestrant After Progression on Prior CDK4/6 Inhibitor in HR+, HER2– Advanced Breast Cancer @KalinskyKevin @BianchiniGP @ErikaHamilton9 @DrSGraff @drsarahsam @MuozMateu 🔬 Phase 3, double-blind trial (n=368): abemaciclib or placebo plus fulvestrant in HR+, HER2– ABC after progression on prior CDK4/6i + ET. Final OS analysis. ➡️ Median OS 32.1 vs 24.6 mo; HR 0.80 (0.60–1.06); p=0.1145, statistical significance not reached ➡️ Updated PFS HR 0.78 (0.62–0.99); nominal p=0.0390 ➡️ Safety consistent with the established abemaciclib profile; no new signals ✅ Numerically longer median OS, not statistically significant. While absolute PFS benefit was modest, overall evidence supports considering abemaciclib-based treatment after disease progression on prior CDK4/6i + ET. #BreastCancer 🎙️ Kevin Kalinsky 👥 Giampaolo Bianchini · Erika Hamilton · Stephanie Graff · Kyong Hwa Park · Rinath Jeselsohn · Umut Demirci · Miguel Martin · Rachel Layman · Sara Hurvitz · Sarah Sammons · Peter Kaufman · Montserrat Muñoz · Jiun-I Lai · Holly Knoderer · Cynthia Sandoval · Aarti Chawla · Bastien Nguyen · Yanhong Zhou · Elizabeth Ravenberg · Lacey Litchfield · Lillian Smyth · Seth Wander (4Sight Made from Abstracts publicly available at the ESMO website) Pinging OncoAlert Breast Cancer Faculty @matteolambe @aftimosp @E_de_Azambuja @DrSGraff @ErikaHamilton9 @hoperugo @stolaney1 @BianchiniGP @aftimosp @kevinpunie @ElisaAgostinett @to_be_elizabeth @GaiaGriguolo @JankovicK @raalbany @JavierCortesMD @JaniceTNBCmets @Prof_Nadia_H @LoiSher @jamecancerdoc @Lucarecco @Dr_Oncologista
Mirrors of Medicine@mirrorsmed 引用@OncoAlert 4Sight Abstracts to be Presented at #ESMO26 1RO: Final Overall Survival Analysis of postMONARCH: Abemaciclib Plus Fulvestrant After Progression on Prior CDK4/6 Inhibitor in HR+, HER2– Advanced Breast Cancer @KalinskyKevin @BianchiniGP @ErikaHamilton9 @DrSGraff @drsarahsam @MuozMateu 🔬 Phase 3, double-blind trial (n=368): abemaciclib or placebo plus fulvestrant in HR+, HER2– ABC after progression on prior CDK4/6i + ET. Final OS analysis. ➡️ Median OS 32.1 vs 24.6 mo; HR 0.80 (0.60–1.06); p=0.1145, statistical significance not reached ➡️ Updated PFS HR 0.78 (0.62–0.99); nominal p=0.0390 ➡️ Safety consistent with the established abemaciclib profile; no new signals ✅ Numerically longer median OS, not statistically significant. While absolute PFS benefit was modest, overall evidence supports considering abemaciclib-based treatment after disease progression on prior CDK4/6i + ET. #BreastCancer 🎙️ Kevin Kalinsky 👥 Giampaolo Bianchini · Erika Hamilton · Stephanie Graff · Kyong Hwa Park · Rinath Jeselsohn · Umut Demirci · Miguel Martin · Rachel Layman · Sara Hurvitz · Sarah Sammons · Peter Kaufman · Montserrat Muñoz · Jiun-I Lai · Holly Knoderer · Cynthia Sandoval · Aarti Chawla · Bastien Nguyen · Yanhong Zhou · Elizabeth Ravenberg · Lacey Litchfield · Lillian Smyth · Seth Wander (4Sight Made from Abstracts publicly available at the ESMO website) Pinging OncoAlert Breast Cancer Faculty @matteolambe @aftimosp @E_de_Azambuja @DrSGraff @ErikaHamilton9 @hoperugo @stolaney1 @BianchiniGP @aftimosp @kevinpunie @ElisaAgostinett @to_be_elizabeth @GaiaGriguolo @JankovicK @raalbany @JavierCortesMD @JaniceTNBCmets @Prof_Nadia_H @LoiSher @jamecancerdoc @Lucarecco @Dr_Oncologista
Kazuki Nozawa, MD@kazuki_nozawa Annals of Oncology@Annals_Oncology Mitsuo Terada, MD, PhD@乳腺科医@MamMa_mimumemo CDK4/6i後のAbema+FUL vs FULのpostMONARCHのOS。
Elvina Almuradova@Dr_ElvinaA Lilly Oncology Medical@LillyOncMed Kristina Jankovic, MD@JankovicK Giampaolo Bianchini@BianchiniGP KOL Pulse AI@KolPulseAI ScienceLink@sciencelinkonco MBC Advocate@MBCadvocate Ülviye Oflas@ulvyeoflas